Superheater.



J. MILNE.

SUPERHEATER.

APPLIGATION PILBD AUG.24,1910

997, 688. Patented July 11,1911.

3 SHBETS-SHEET 1 72/ i I 7 r 29 J. MILNE.

SUPERHEATER.

APPLIGATION PILED AUG. 24, 1910.

I 70 ///////////////////W/fl/W//fl o a o o o o o o I o O %ita mema Patented Jul 11, 1911.

3 SHEETS-SHEET 2.

997158&

J MILNE.

SUPERHEATER.

APPLICATION FILED AUG.24, 1910.

Patented July 11, 1911.

3 SHEETS-SHEET 3.

- 0/7 2761/ %fil i/:what 3% JOHN MILNE, OF NEW YORK, N'. Y.

V SUPERHEATER.

Application -flled August 24, 1910. Serial No. 578,'i52.

To all whom it 'may concem:

Be it known that I, JOHN MILNE, a citizen of the United States, and a resident of the borough of Manhattan, in the County of New York and State of'New York, have invented certain new and useful Improvements in Superheaters, of which the following is a specification.

This invention relates to steam superheaters, which may be applied to various types of boilers. The invention is represented in this instance with a two drum boiler in which -a duct is formed for directly leading the heated gases from the combust-ion chamber to the superheater.

In the accompanying drawings Figurel represents a vertical section of a boiler with the invention connected up therewith, Fig. 2 showsa top plan View and partial section of Fig. 1, on the line 2, 2, Fig. 3 represents a partial section of Fig. 1 on the line 3, 3, Fig. 4 represents a fragmentary portion of the boiler shown in Fig. 1 and a modification of the invention, and Fig. 5 shows a partial section of Fig. 4 on the line 5, 5.

Referring particularly to Figs. 1 to 3, a boiler is shown to comprise the upper or steam drum' 20, the lower drum 21, the central nest of steam generating tubes 22 and the outer nests of steam 'generating tubes 23 and 24.

A main chamber 25 of the boiler is formed with inclosing structure of the boiler, the said structure comprising the front Wall 26, rear wall 27, side walls 28 and roof 29. A partition 30 extends from the drum 20 to within a short distance of the drum 21, and a partition31 extends from the drum 21 to within a short distance of the drum 20. Openings 32, 33, 34, with doors not shown are formedvin the sdes 28 of the said structure. 'The combustion chamber 38 of the boiler is represented with the arch 39 from which extends a wall 40 connecting the sides 28, and forming a duct 41 leading from the said combustion chamber 38 to the upper portion of *the chamber 25 and a damper 42 operates in said duct. An opening 50 with the door 51 is shown in the front wall 26,

as well as the opening 52 with the furnace door 53, and the` opening 54 with the ash pit door 55. Grates 56 extend from the opening 52 to the central wall 57.

Channel irons 60, 61, with the end plates 62 and removable cover 64 formanisolated chamber 65 in the drum 20. Rows of inclined outer return bend or U shaped superheating tubes 67 have' their inlet legs 68 extending from the drum 20 outside of the isolated chamber 65, and above the normal Water line 69 in the drum. The outlet legs 70 of said tubes enter the chamber 65 of the drum. Rows of inclined inner return bend or U shaped superheating tubes 71 have their inlet legs 72 extending from the drum 20 outside of the said isolated chamber 65, above said water line 69, and their outlet legs 73 enter the chamber 65. The planes of the tubes 67 and 71 preferably alternate .with each other. A protecting and insulating cover 74 preferably of asbestos covers the drum 20 to prevent its injury by the heated gases of the combustionchamber 38u A steam outlet 75 extends from the chamber 65 of the drum-20. The tubes 67 and 71 constitute the superheater for the boiler.

In the operation of the boiler the hot gases generated in the combustion chamher 38 are divided in their upward flow by the arch 39, taking the directions shown by the arrows and 81, the former directly heating the nests of steam generating tubes 22, 23, 24 and the gases taking the direction of the arrows 81 entering the duct 41 to directly heat the steam superheating tubes 67, 71 and then heating the said nests of steam generating tubes. The damper 42 controls the Volume of ases passing through the duct 41 to heat t e said superheating tubes.

In Figs. 4 and 5, fragmentaryportions of the same boiler are shown while the superheate' is modified and comprises rows of inclined double return bend tubes each having four legs, comprising the inlet legs 85 extending from the drum 20 above the water level 69 and the outlet legs 86 entering the chamber 65. a.

`A U shaped member with the le s 87 and 88 connects the legs 85 and 86. he gases from the chamber 38 take directions as already described, and the steam generated in the drum 20 enter`the legs 85, then passes through the legs 87, 88 and'finally is con- I ducted through the legs 86, to enter the chamber 65.

The superheater inany of the forms ,of

my invention can b'e flooded by raising the,

bination of a drum, an isolated chamber in said drum, a removable cover for said chamber, tubes with one -end of each extending fromthe. drum outside of the isolated chamber, and their other ends connected to said chamber, and means to directly expose the tubes to heated gases without previously coming in contact wit-h any steam generating portions of the boiler.

2. The combination of a drum of a boiler, U shaped superheating tubes connected up with the drum, an inclosure for said tubes, a

means to directly expose the said tubes toheated gases without previously coming in contact with any 'steam generating portions of the boiler and means to partially insulate the drum from the heated gases.

4. In a s uperheaterthe combination of a drum, an isolated chamber formed in said drum, rows of outer U shaped superheating tubes with one-leg of each extending from the drum outside of the isolated chamber. and with the other legs thereof connected to ,said isolated chamber, rows of inner U shaped tubes with oneleg of each extending from said drum and the other leg thereof connected to said isolated chamber, a duct to directly expose the tubes to heated gases, and means to conduct superheated steam from said isolated chamber.

5. The combination with the 'drum of a boiler of an isolated chamber in the drum, U shaped superheatingtub'es with one end of each connected to the drum and the other end connected to the said chamber, an inclosure for the tubes, a combustion chamber in the inclosure and a duct leading from the combustion chamber to the said tubes to directly heat the latter.

6. The combination with a drum of a boiler of an a isolated chamber therein, a superheater comprising rows of double return bend tubes, inlet legs and outlet legs for each tube, the said inlet legs connected to the drum above the normal water level therein and the said outlet legs connected to said isolated chamber,'- a combustion chamber for the boiler, a duct to' lead the products of combustion to said tubes, and an outlet for the isolated chamber.

7. The combination with the drum of a boiler of an isolated chamber in the drum, a superheater comprising rows of double return bend tubes, inlet legs and outlet legs for each tube, the said inlet legs connected to the drum above the normal water level therein, and the said outlet legs conected to said isolated chamber, a combustion chamber for the boiler, a duct to lead heated gases from said combustion chamber directly to said superheater and an ,outlet connected with said isolated chamber on the' outside of said drum.

8. The combination with a drum of a boiler of 'an isolated chamber in the drum, a superheater comprising rows of double return bend tubes, inlet legs and outlet legs for each tube, the said inlet legs connected to the drum above the normal water level therein, the said legs connected to said isolated chamber, a combustion chamber for the boiler, and a duct to lead heated gases fromthe combustion chamber' directly to said superheater, an outlet connected with said isolated chamber on theoutsde of said drum, man-holes on the drum and a damper in said duet. i

9. The combination with the drum of a boiler of an isolated chamber therein, superheating tubes with one end of each connected to the drum outside of said chamber and the other end of each tube connected to said chamber, an inclosure for the tubes, an opening in said inclosure adjacent to the tubes, a cover for said opening, and means for the combustion of fuel in said inclosure and to lead the 'products of said conbustion 'tothe County of New' York and State of New York this 20th day of August A. D. 1910.

` JOHN MILNE.` witnesses: A. A. DE BONNEVILLE, Arrmm MARION.- 

